Phineas and Ferb invent, scheme and stay one step ahead of their bratty sister. Meanwhile, their pet platypus plots against evil Dr. Doofenshmirtz.

[repeated line]
Dr. Heinz Doofenshmirtz: Curse you, Perry the Platypus!
Candace: Mom! Phineas and Ferb are making a title sequence!
[repeated line]
Phineas: Hey, where's Perry?
[repeated line]
Isabella: Whatcha *do*-in'?
Various adult "inspectors": Aren't you too young to...?
Phineas: Yes... Yes we are/Yes I am
[repeated line]
Phineas: I know what we're gonna do today.
[repeated line]
Candace: You guys are so *busted*.
[repeated line]
Candace: Mom Mom, look what Phineas and Ferb are doing.
[repeated line]
Perry the Platypus: Ctrctrctr...
[makes a chattering sound with his teeth, usually when in "animal mode"]
[repeated line]
Phineas: Ferb, I know what we're gonna do today!
[repeated line]
Phineas: Oh, there you are, Perry!